> For the TLB issue, higher order pagecache doesn't help. If distros> ship with a 4K page size on powerpc, and use some larger pages in> the pagecache, some people are still going to get angry because> they wanted to use 64K pages... But I agree 64K pages is too big> for most things anyway, and 16 would be better as a default (which> hopefully x86-64 will get one day).

Powerpc supports multiple pagesizes. Maybe we could make mmap use those page sizes some day if we had a variable order page cache. Your stands on the issue means that powerpc will be forever crippled and not be able to use its full potential.

> Anyway, for io performance, there are alternatives, dispite what> some people seem to be saying. We can submit larger sglists to the> device for larger ios, which Jens is looking at (which could help> all types of workloads, not just those with sequential large file> IO).

Right this could help but it is not addressing the basic requirement fordevices that need large contiguuos chunks of memory for I/O.-To unsubscribe from this list: send the line "unsubscribe linux-kernel" inthe body of a message to majordomo@vger.kernel.orgMore majordomo info at http://vger.kernel.org/majordomo-info.htmlPlease read the FAQ at http://www.tux.org/lkml/